Application potential of articulated coupled drive and guide elements for increase of movement dynamics and accuracy
Engineering Design, Machine Elements, Product Development
Production Systems, Operations Management, Quality Management and Factory Planning
Final Report Abstract
Due to the increasing demands on productivity and product quality of machine tools, the trend in the development of drive systems is towards high movement dynamics with constant or increased accuracy. In the case of standardized machine elements in linear axes, such as profile rail guides, mechanical stresses occur even with small deviations in shape and position. One approach for the design of highly dynamic drive systems is the use of several drives per axis direction (e.g. gantry design). In such drive systems, mechanical overdetermination occurs in the direction of motion, which can result in high constraining forces in the guides and drives as well as dynamic interaction of the drive controllers and associated stability problems. A possible solution to this problem is the introduction of additional joints into the structure. The object of the research project was the fundamental and systematic investigation and evaluation of the potential of parallel drives with elastic connection of the drive and guide elements. The focus was on the use of compliant joints, where the motion is guided by material deformation, in contrast to conventional rolling and sliding guides. Due to the absence of backlash and friction, these elements enable a high degree of motion accuracy and also have an increased degree of parameterization freedom. In the second phase of the project, the experimental proof, completed by simulation analyses, of the increase in dynamics achievable by mechanical decoupling (e.g. higher controller bandwidths), the reduction of constraining forces in the guidance and drives, and an increase in accuracy through the correction of motion deviations was provided on a representative drive arrangement with high application relevance. A modular concept for joints was developed and exemplarily integrated and investigated on a test vehicle with gantry drive. In order to enable a more precise determination of the parameter influence on the joint and drive properties, extensive simulation models for static and transient analyses and their experimental verification were also created. In addition, suitable controller structures were identified especially for the application of parallel drives, and their potential was demonstrated with regard to the aforementioned goals. In addition to the previously used joints, functionally extended components, which enable adaptive adjustment of the joint properties by means of integrated actuators and sensors, were also to be investigated and evaluated.
Publications
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Compliant joints for the improvement of the dynamic behaviour of a gantry stage with direct drives. Journal of Machine Engineering, 20(3), 17-29.
PÖHLMANN, Patrick; PEUKERT, Christoph; MERX, Marcel; MÜLLER, Jens & IHLENFELDT, Steffen
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Compliant joints for the improvement of the dynamic behaviour of a gantry stage with direct drives. Konferenzbeitrag: XXXI CIRP sponsored conference on supervising and diagnostics of machining systems, 8-12 March 2020, Karpacz, Poland
Pöhlmann, P.; Peukert, C.; Merx, M.; Müller, J. & Ihlenfeldt, S.
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Control Strategies for a Gantry Stage equipped with Flexible Joints using Frequency Response Methods. Konferenzbeitrag: 16th International Conference on High Speed Machining, 26-27 Oktober 2021, Darmstadt, Germany
Pöhlmann, P.; Merx, M.; Müller, J. & Ihlenfeldt, S.
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CONTROL STRATEGIES FOR A GANTRY STAGE EQUIPPED WITH FLEXIBLE JOINTS USING FREQUENCY RESPONSE METHODS. MM Science Journal, 2021(5), 5008-5014.
Poehlmann, P.; Merx, M.; Mueller, J. & Ihlenfeldt, S.
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Compliant Joints with Remote Centre of Compliance for the Improvement of the Motion Accuracy of a Gantry Stage. Journal of Machine Engineering.
Patrick, Pöhlmann; Christoph, Peukert; Marcel, Merx; Jens, Müller & Steffen, Ihlenfeldt
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Compliant Joints with Remote Centre of Compliance for the Improvement of the Motion Accuracy of a Gantry Stage. Konferenzbeitrag: XXXIII CIRP sponsored conference on supervising and diagnostics of machining systems, 26-30 Juni 2022, Karpacz, Poland
Pöhlmann, P.; Peukert, C.; Merx, M.; Müller, J. & Ihlenfeldt, S.
